This is an alternative version of the DX9 antenna adapter cap for higher gain (dBi) antenna modification of the Spektrum DX9 radio.
Option 1 – One Antenna
For use with one SMA-connector, and one «blind» SMA-connector for storing one dummy load while antenna is mounded on the radio.
Option 2 – Two Antennas
For use with two SMA-connectors, if you want both horizontal and vertical monted higher gain antennas.
Link for how to modify your radio: